PCIe Laptop Adapter for Mojo DX

I'm running MC7 on my late 2011 Macbook Pro. I have one available thunderbolt port.

I keep all projects and media on a portable drive that I run over thunderbolt. The MBP is no longer my primary system, but I go on the road enough that I'm trying to be able to use my MOJO DX with my laptop AND the external thunderbolt drive.

Long story, short - anybody know how to get ahold of an AVID PCIe Laptop Adpater (now a discontinued product)? Am I just plain too late to this game...? :-)